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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Oct. 31, 2016
Entity Registrant Name dei_EntityRegistrantName PRINCIPAL FUNDS INC
Central Index Key dei_EntityCentralIndexKey 0000898745
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jul. 01, 2017
Document Effective Date dei_DocumentEffectiveDate Jul. 01, 2017
Prospectus Date rr_ProspectusDate Mar. 01, 2017
Supplement [Text Block] ck0000898745_SupplementTextBlock
Principal Funds, Inc.
Supplement dated July 1, 2017
to the Statutory Prospectus dated March 1, 2017, as revised May 2, 2017
(as supplemented on June 16, 2017)
This supplement updates information currently in the Statutory Prospectus. Please retain this supplement for future reference.
PFI Prospectus [Member] | MidCap Growth Fund III [Member]  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading MIDCAP GROWTH FUND III
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Delete the Annual Fund Operating Expenses table and footnotes and replace with the following:Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Delete the Example section and replace with the following:
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
PFI Prospectus [Member] | MidCap Growth Fund III [Member] | MidCap Growth III Fund, Class J [Member]  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol PPQJX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.97%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.25%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2018
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 227
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 414
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 721
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,594
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 127
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 414
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 721
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,594
PFI Prospectus [Member] | MidCap Growth Fund III [Member] | MidCap Growth III Fund, Institutional Class [Member]  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol PPIMX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.97%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.99%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.91%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2018
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 93
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 307
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 539
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,206
PFI Prospectus [Member] | MidCap Growth Fund III [Member] | MidCap Growth III Fund, Class R-1 [Member]  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol PHASX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.97%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.86%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.78%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2018
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 181
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 577
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 998
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,173
PFI Prospectus [Member] | MidCap Growth Fund III [Member] | MidCap Growth III Fund, Class R-2 [Member]  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol PPQNX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.97%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.30% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.45% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.73%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2018
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 168
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 537
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 931
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,034
PFI Prospectus [Member] | MidCap Growth Fund III [Member] | MidCap Growth III Fund, Class R-3 [Member]  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol PPQMX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.97%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.55%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.47%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2018
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 150
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 482
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 837
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,839
PFI Prospectus [Member] | MidCap Growth Fund III [Member] | MidCap Growth III Fund, Class R-4 [Member]  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol PPQSX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.97%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.36%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.28%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2018
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 130
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 423
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 737
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,628
PFI Prospectus [Member] | MidCap Growth Fund III [Member] | MidCap Growth III Fund, Class R-5 [Member]  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol PPQPX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.97%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.24%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.16%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2018
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 386
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 673
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,493
[1] Expense information in the table has been restated to reflect current fees.
[2] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund's Management Fees through the period ending June 30, 2018. The fee waiver will reduce the Fund's Management Fees by 0.08% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement may mutually agree to terminate the fee waiver prior to the end of the period.